java - Get DefaultTableModel from JTable -

i want defaulttablemodel jtable , add column that. search in jtable find getmodel() method.then can't add column that. in end use binding method set date in jtable haven't defaulttablemodel , want add column content jbutton add jtable.

• again, sure can't add new tablecolumn jtable based on defaulttablemodel initalized mytable.getmodel()

• edit can see without casting (defaulttablemodel model = (defaulttablemodel) table.getmodel();) jtable can returns tablemodel, , there isn't addcolumn()

import java.awt.borderlayout; import java.awt.eventqueue; import java.awt.font; import java.awt.event.actionevent; import java.awt.event.actionlistener; import java.util.stack; import javax.swing.jbutton; import javax.swing.jframe; import javax.swing.jpanel; import javax.swing.jscrollpane; import javax.swing.jtable; import javax.swing.windowconstants; import javax.swing.table.defaulttablemodel; import javax.swing.table.tablecolumn; import javax.swing.table.tablecolumnmodel;  public class tablerowheight {      private static final long serialversionuid = 1l;     private jframe frame = new jframe("p*s*s*s*s*t*t");     private string[] columnnames = {"one", "two", "playing with", "four", "five",};     private string[][] data = {         {"aaaaaa", "bbbbbb", "cccccc", "dddddd", "eeeeeee",},         {"bbbbbb", "cccccc", "dddddd", "eeeeeee", "aaaaaa",},         {"cccccc", "dddddd", "eeeeeee", "aaaaaa", "bbbbbb",},         {"dddddd", "eeeeeee", "aaaaaa", "bbbbbb", "cccccc",},         {"eeeeeee", "aaaaaa", "bbbbbb", "cccccc", "dddddd",}};     private jtable table = new jtable(new defaulttablemodel(data, columnnames));     private tablecolumnmodel tcm = table.getcolumnmodel();     private stack<tablecolumn> coldeleted = new stack<tablecolumn>();     private jbutton restorebutton = new jbutton("restore column size");     private jbutton hidebutton = new jbutton("set column size zero");     private jbutton deletebutton = new jbutton("delete column");     private jbutton addbutton = new jbutton("restore column");     private jbutton addnewbutton = new jbutton("add new column");     private int = 1;      public tablerowheight() {         table.setrowmargin(4);         table.setrowheight(30);         table.setfont(new font("sansserif", font.bold + font.plain, 20));         jscrollpane scrollpane = new jscrollpane(table);         (int = 0; < (tcm.getcolumncount()); i++) {             tcm.getcolumn(i).setpreferredwidth(150);         }         table.setpreferredscrollableviewportsize(table.getpreferredsize());         restorebutton.addactionlistener(new actionlistener() {             @override             public void actionperformed(actionevent e) {                 tcm.getcolumn(2).setpreferredwidth(100);             }         });         hidebutton.addactionlistener(new actionlistener() {             @override             public void actionperformed(actionevent e) {                 tcm.getcolumn(2).setpreferredwidth(000);             }         });         deletebutton.addactionlistener(new actionlistener() {             @override             public void actionperformed(actionevent e) {                 if (table.getcolumncount() > 0) {                     tablecolumn coltodelete = table.getcolumnmodel().getcolumn(table.getcolumncount() - 1);                     table.removecolumn(coltodelete);                     table.validate();                     coldeleted.push(coltodelete);                     addbutton.setenabled(true);                 } else {                     deletebutton.setenabled(false);                 }             }         });         addbutton.addactionlistener(new actionlistener() {             @override             public void actionperformed(actionevent e) {                 if (coldeleted.size() > 0) {                     table.addcolumn(coldeleted.pop());                     table.validate();                     deletebutton.setenabled(true);                 } else {                     addbutton.setenabled(false);                 }             }         });         addnewbutton.addactionlistener(new actionlistener() {             @override             public void actionperformed(actionevent e) {                 defaulttablemodel model = (defaulttablemodel) table.getmodel();                 model.addcolumn("new column " + i);                 i++;             }         });         jpanel btnpanel = new jpanel();         btnpanel.add(hidebutton);         btnpanel.add(restorebutton);         btnpanel.add(deletebutton);         btnpanel.add(addbutton);         btnpanel.add(addnewbutton);         frame.setdefaultcloseoperation(windowconstants.exit_on_close);         frame.add(scrollpane, borderlayout.center);         frame.add(btnpanel, borderlayout.south);         frame.pack();         frame.setlocation(150, 150);         frame.setvisible(true);     }      public static void main(string[] args) {         eventqueue.invokelater(new runnable() {             @override             public void run() {                 tablerowheight frame = new tablerowheight();             }         });     } }